JP3087221B2 - Image sensor including color filter array and color complementary device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image sensor (im
age sensor), especially vertical interpolation (vertical
interpolation) relates the process have a color filter array (color filter array) and the signal processing circuitry required, video cameras, digital cameras and color scanners, widely applied in a color copying machine such as an image signal input and the signal processing field of processing image signals it can.

[0002]

2. Description of the Related Art Conventionally, a color image sensor is covered with a color filter for each basic unit pixel (Pixel), so that the complexity of signal processing is determined (left or right) by the configuration pattern of the color filter. To obtain a color image signal, red (Red) hue filter pixel, green (Gre
en) hue filter pixels and blue (Blue) hue filter pixels, each of which is divided into pixels. For signal processing, each pixel is interpolated to obtain all color signals (RG.
B).

FIGS. 1 (a) and 1 (b) show a conventional color filter array for processing red (hereinafter referred to as R signal), green (hereinafter referred to as G signal), and blue (hereinafter referred to as B signal) signals. FIG. 1A is a diagram showing a configuration , and FIG.
Is composed of RGB, GBR, and BRG patterns, and FIG. 1B is composed of RGB and GB patterns. In FIG. 1A, the R, G, and B signals intersect each other every three pixels, so that the pixel values between the signals are obtained by interpolation processing.
The interpolation processing equations for obtaining the respective color signals (C ₁₂ ) and (C ₂₁ ) for two pixels between the signal (C ₁ ) and the second signal (C ₂ ) are as follows:

[Number 1] is as.

[0004]

## EQU1 ## Color signal (C ₁₂ ) = 1/3 {(2C ₁ + C ₂ )} Color signal (C ₂₁ ) = 1/3 {(C ₁ + 2C ₂ )} (1)

[0005]

The above-described formula for the interpolation processing requires a calculation of 1/3 times, and it is difficult to process significant figures, so that it has a complicated circuit configuration. Problems arise.

In the color filter array shown in FIG. 1B, the number of green (G) pixels is about twice as large as the number of red (R) and blue (B) pixels in consideration of the degree of human hue perception. However, the above-described structure will be complicated circuitry because requesting a horizontal and vertical interpolation processing Both two and line delay buffer (line for vertical interpolation
There was a problem that the number of circuits increased due to the additional use of delay buffer).

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. A color filter array capable of high-speed processing and capable of performing interpolation processing of a color signal without vertical interpolation with a simple configuration, and a color filter array therefor. It is intended to provide a color complementary device.

[0008]

According to the present invention, a green hue filter and a red hue filter are provided to solve the above-mentioned problems.
Filter and blue hue filters are arranged in a matrix
That Te image sensor odor <br/> including color filter array, the color filter array, and a filter of a green hue to be twice than the number of red and blue colors, in the horizontal direction for the horizontal interpolation calculations red and blue color filters located in each of four pixels, the green color filter is to position every two pixels, the vertical
One of the three horizontal lines successively arranged in an R-G-B-G pattern is repeated,
Is composed by repeating the GRGB pattern ,
One is that the BGRG pattern repeats,
The pattern repeats every three horizontal lines in the vertical direction
Characterized in that it to be.

A green hue signal for each pixel positioned adjacent to the green hue filter of the color filter array in the horizontal direction is supplied to the pixel in the horizontal direction.
Obtained from two green hue filter located on both sides
The first green hue filter signal and the second green
When a lean hue filter signal is obtained, the first green hue filter signal and the second green hue filter signal are each obtained by an operation of halving each of them and then adding them.

Further, any of the above color filter arrays
The signals obtained from the two red hue filters existing close to each other on the horizontal line are respectively converted to the first red hue filter.
And a second red hue filter signal, the red hue signal for the pixel covered by the blue hue filter between the pixels covered by the first red hue filter and the second red hue filter is the first red hue signal. Each of the hue filter signal and the second red hue filter signal is １ ／
It is characterized by being obtained by an operation of adding them after doubling them.

Further, any of the above color filter arrays
Two red hues in close proximity on a horizontal line
The signals obtained from the filters are each converted to a first red hue filter.
When the data signal and the second red color filter signal, the first red color filter and the green color filters close position toward the second red color filter between the second pixel red hue filter is covered is covered The red hue signal for the pixel obtained is obtained by adding a value obtained by multiplying the second red hue filter signal by と and a value obtained by １ ／ and then multiplying the second red hue filter signal by ４. It is obtained by an operation of adding the calculated values again.

Further , any of the above color filter arrays
Two blue hues in close proximity on a horizontal line
The signals obtained from the filters are each converted to a first blue hue filter.
And the second blue hue filter signal,
The blue hue signal for the pixel covered by the red hue filter between the pixels covered by the blue hue filter and the second blue hue filter is を times the first blue hue filter signal and the second blue hue filter signal, respectively. And then adding them.

Further , any of the above color filter arrays
Two blue hues in close proximity on a horizontal line
The signals obtained from the filters are each converted to a first blue hue filter.
And the second blue hue filter signal,
The blue hue signal for the pixel covered by the red hue filter between the pixels covered by the blue hue filter and the second blue hue filter is を times the first blue hue filter signal and the second blue hue filter signal, respectively. And then adding them.

Further, any of the above color filter arrays
Two blue hues in close proximity on a horizontal line
The signals obtained from the filters are each converted to a first blue hue filter.
Signal and the second blue hue filter signal, the first
The blue hue signal for the pixel covered by the green hue filter located closer to the first blue hue filter between the pixels covered by the blue hue filter and the second blue hue filter is the first blue hue filter signal. And a value obtained by adding a value obtained by multiplying the second blue hue filter signal by し て and adding a value obtained by adding 値 times the second blue hue filter signal again.

Further , any of the above color filter arrays
Two blue hues in close proximity on a horizontal line
The signals obtained from the filters are each converted to a first blue hue filter.
And the second blue hue filter signal, the green hue filter located closer to the second blue hue filter between the pixels covered by the first blue hue filter and the second blue hue filter is covered by the green hue filter. The blue hue signal for the pixel obtained is a value obtained by adding a value obtained by multiplying the second blue hue filter signal by と and a value obtained by １ ／ and then multiplying the first blue hue filter signal by ４. Is obtained by an operation of adding again.

Further, each of the above hue filter signals is reduced by half.
The above-mentioned value is obtained by shifting each hue filter signal by one bit in the lower bit direction.

Further, the green hue filter is configured to be twice the number of red and blue hue filters,
For the horizontal interpolation calculation, the red and blue color filters are located every four pixels in the horizontal direction, and the green color filters are located every two pixels, and are continuously arranged in the vertical direction.
One of the three horizontal lines is RGB-B.
-The G pattern is repeated and another is G-
An RGB pattern is repeatedly formed, and the other one is formed by repeating a BGRG pattern.
A pattern is formed every three horizontal lines in the vertical direction
An apparatus for interpolating color signals for each pixel of a color filter array that, close on any horizontal line
Signals obtained from two existing green hue filters
The first green hue filter signal and the second green
When the emission color filter signal, the first and second green color filter signal by interpolating said two green hues
And green hue signal section for outputting a green color filter signals of pixels present between the filter, either horizontal Rye
From two red hue filters that are in close proximity on the
The obtained signals are respectively referred to as a first red hue filter signal and a
When two red hue filter signal, the upper Symbol first and second
Interpolates the red hue signal to the above two red hue fills.
A red hue signal for outputting a red hue signal of a pixel existing between the pixels and a signal obtained from two blue hue filters existing close to one of the horizontal lines are a first blue hue filter signal and a second hue filter signal, respectively. A blue hue signal section for interpolating the first and second blue hue filter signals to output a blue hue signal of a pixel existing between the two blue hue filters when the two blue hue filter signals are used. It is characterized by becoming.

The green hue signal section includes first and second green hue signal storage means for receiving and storing the first and second green hue filter signals input from the first and second green hue filters. First and second shifting means for shifting the signals output from the first and second green hue signal accumulating means by one bit in the lower bit direction, respectively, and the first and second shifting means and the second shifting means. A first adding means for adding the output signals and outputting a green hue signal of the peripheral pixel interpolated.

Further, the red hue signal section is provided with the first hue signal section.
First and second red hue signal storage means for receiving and storing first and second red hue filter signals input from the first and second red hue filters, and output from the first and second red hue signal storage means. Third and fourth shifting means for shifting the signal one bit at a time in the lower bit direction, and the first and fourth signals obtained by adding the signals output from the third shifting means and the fourth shifting means are interpolated. A second adding means for outputting a red hue signal for a pixel covered by the blue filter between a red hue filter and a pixel covered by the red hue filter; and a signal outputted from the third or fourth shifting means. Fifth or sixth shifting means for re-shifting each bit by one bit in the lower bit direction, the third shifting means and the fifth shifting means. A third adding means for adding again the signal outputted from the switching means, the first red hue filter interpolated by adding again the signal outputted from the sixth shifting means and the signal outputted from the third adding means, and Fourth adding means for outputting a red hue signal for a pixel covered with the green hue filter located closer to the first red hue filter between pixels covered by the second red hue filter; and the fourth shifter Fifth adding means for adding again the signals output from the input means and the sixth adding means;
The second red hue between pixels covered with the first red hue filter and the second red hue filter interpolated by adding again the signals output from the fifth shifting means and the fifth adding means. And a sixth adding means for outputting a red hue signal for a pixel covered with the green hue filter located closer to the filter.

Further, the blue hue signal section is provided with the first hue signal section.
First and second blue hue signal accumulating means for receiving and accumulating the first and second blue hue filter signals input from the first and second blue hue filters, and output from the first and second blue hue signal accumulating means. Seventh and eighth shifting means for shifting each signal by one bit in the lower bit direction, and the first and second signals interpolated by adding the signals output from the seventh and eighth shifting means. A seventh adding means for outputting a blue hue signal for a pixel covered by the red hue filter between a pixel covered by the blue hue filter and the second blue hue filter; and an output from the seventh or eighth shifting means. A ninth or a tenth shifting means for re-shifting each of the output signals by one bit in the lower bit direction, the seventh shifting means, Eighth adding means for adding again the signals output from the nine shifting means, and the first blue hue filter interpolated by adding again the signals output from the tenth shifting means and the eighth adding means. And the first blue pixel between the pixels covered with the second blue hue filter.
Ninth adding means for outputting a blue hue signal to a pixel covered with the green hue filter which is located closer to the blue hue filter, the eighth shifting and the first
0 to add the signals output from the 0 shifting again
0 adding means, the ninth shifting means, and the tenth shifting means.
The green hue filter positioned closer to the second blue hue filter between the pixels covered by the first blue hue filter and the second blue hue filter interpolated by adding the signals output from the addition means again and interpolated And an eleventh adding means for outputting a blue hue signal for the pixels covered with the color-coded pixels.

[0021]

Embodiments of the present invention will be described below with reference to FIG. In addition, the same reference numerals are given to the same parts and portions in each embodiment, and the overlapping description will be omitted.

FIG. 2 shows a configuration of a color filter array according to the present invention, in which RGBG, GRG are used.
-B and BGRG patterns. The green hue filter was configured to be twice as many as the number of red or blue hue filters so that a person could easily recognize the hue, and the red, green, and blue hue filters were positioned on the horizontal array. That is, in the configuration of the conventional color filter array, red (R) hue information and blue (B) hue information are located every other line in FIG. Therefore,
R, G, and B hue signal information can be provided for each pixel only by horizontal interpolation processing.

The red (R) and blue (B) hue filters are located every four pixels, and the green (G) hue filters are located every two pixels. so as to made it be <br/> allow only interpolation calculation when simple addition and shifting operation of the interpolation. In other words, there are many consumption of complex or One calculation time
But it may also not be in operation.

FIG. 3 is a block diagram for horizontal interpolation processing in the configuration of the color filter array according to the present invention. First, the operation will be described with reference to FIGS. 2 and 3. Since a green (G) hue filter is input for every two pixels, signal processing for color complementation for each pixel is as follows.
Each of the first green hue filter signal (G1) and the second green hue filter signal (G2) is obtained as a value obtained by multiplying by １ ／ and then adding. Here, the calculation of 1/2 times may be performed by shifting one bit in the lower bit direction.

Next, a red (R) hue filter and a blue (B) hue filter are input for every four pixels, so

The horizontal interpolation value is obtained by the following equation.

[0026]

[Number 2] _{R 112 = 1/4 (R} 1 + 2R 1 + R 2), B 112 = 1/4 (B 1 + 2B 2 + B 2) R 12 = 1/2 (R 1 + R 2), B 1 2 = _{1/2 (B 1 + B 2)} , R 122 = 1/4 (R 1 + R 2 + 2R 2), B 122 = 1/4 (B 1 + B 2 + 2B 2) · ·· (2)

The above

The R ₁ in Equation 2] first red color filter signal, R ₂ the second red color filter signal, R _{11 2} is close pixels (green color filter toward the R ₁ between the R ₁ and R ₂ The red hue signal for the covered pixel), R ₁₂ is the red hue signal for the pixel located between R ₁ and R ₂ (the pixel covered by the blue hue filter), and R ₁₂₂ is towards R ₂ Red color signal for close pixels (pixels green hue filter is covered), B ₁ is the first blue color filter signal, B ₂ is the second blue color filter signal, B ₁₁₂ and B between B ₁ and B ₂ A blue hue signal for a pixel closer to ₁ (a pixel covered with a green hue filter), B ₁₂ is B
₁ and the pixel located in the middle of B ₂ blue hue signal for (pixels red color filter is covered), B ₁₂₂ is (pixels green hue filter is covered) pixel closer to the B ₂
Respectively show the blue hue signals for.

The interpolated values of R ₁₁₂ and B ₁₁₂ are respectively

As shown in Equation 2, the value obtained by shifting the R ₁ or B ₁ value by ₁ bit in the direction of the lower bits and the value shifted by 2 bits are added, and then the value of R ₂ or B ₂ is shifted by ₂ bits in the direction of the lower bits. It is obtained by adding the shifted value. R ₁₂ and B ₁₂
In the case of

As shown in Equation 2, R ₁ or B ₁ and R ₂ or B ₂ may be shifted by one bit in the direction of the lower bit, and then added.

The interpolation values of R ₁₂₂ and B ₁₂₂ are respectively

As shown in Equation _{2, the} value obtained by shifting the R ₂ or B ₂ value by 1 bit in the direction of the lower bits and the value shifted by 2 bits are added, and then the value of R ₁ or B ₁ is shifted by 2 bits in the direction of the lower bits. It is obtained by adding the shifted value.

As shown in FIG. 3, the circuit for operating as described above converts the first and second green hue filter signals (G1) and (G2) input from the first and second green hue filters, respectively. After interpolation, a green (G) hue signal section (300) that outputs a green hue signal (G12) of the peripheral pixel, and first and second red hue filter signals (R) input from the first and second red hue filters. After interpolating ₁ ) and (R ₂ ), a red (R) hue signal section (400) that outputs red hue signals (R ₁₁₂ ) and (R ₁₂₂ ) of peripheral pixels, and inputs from the first and second green hue filters the first and second green color filter signal is (B _1, B ₁₎ after interpolating, blue for outputting a blue color signal near the pixel (B _112, B ₁₂₂₎ (B) color signal unit (500) Ranaru.

The green hue signal section (300) receives first and second green hue filter signals (G1) and (G2) input from the green hue filter and stores the first and second green hue signal registers (G2). 3
0), (31), first and second right shifters (32 and 3) for shifting the signals output from the first and second green hue signal registers (30 and 31) one bit to the right, respectively.
3), the first right shifter (32) and the first adder for outputting a G ₁₂ is a green hue signals of the peripheral pixels to the signal output is added to the interpolation from the second right shifter (33) ( 34), and the red hue signal section (4)
00) receives the first and second red hue filter signals (R ₁ ) and (R ₂ ) input from the red hue filter and stores the first and second red hue signal registers (35) and (36), respectively. ), A third or fourth right register (37 and 38) for shifting the signals output from the first and second red hue signal registers (35 and 36) one bit to the right, respectively, and a third right shifter (37). ) and a second adder for outputting the fourth right register (38) Red color signal R ₁₂ output signal addition to the peripheral interpolated from (3
9), fifth and sixth right shifters (40 and 41) for shifting the signals output from the third and fourth right shifters (37 and 38) to the right by one bit, respectively, and the third right shifter ( 37) and a third adder (42) for adding again the signal output from the fifth right shifter (40), and a signal output from the sixth right shifter (41) and the third adder (42). Is added again to output the interpolated peripheral red hue signal R _112, and the signals output from the fourth right shifter (38) and the sixth right shifter (41) are again output. A fifth adder (43) to be added, a signal output from the fifth right shifter (40) and the signal output from the fifth adder (43) are added again, and an interpolated peripheral red hue signal R is added.
_A blue (B) hue signal section (500) for outputting the first and second blue hue filter signals (B ₁ ) input from the blue hue filter; Enter (B ₂ ) and store the first
And the second blue hue signal register (46), (4
7), seventh and eighth right shifters (48 and 49) for shifting the signals output from the first and second blue hue registers (46 and 47) one bit to the right, respectively, and the seventh right shifter (48) And the signal output from the eighth right shifter (49) and interpolated and the peripheral blue hue signal B1
7, a ninth and tenth right shifter (51 and 51) for shifting the signals output from the seventh and eighth right shifters (48 and 49) to the right by one bit, respectively. 52), an eighth adder (53) for adding again the signals output from the seventh right shifter (48) and the ninth right shifter (51), the tenth right shifter (52) and the eighth addition A ninth adder (55) for adding the signals output from the adder (53) again to output an interpolated peripheral blue hue signal B112; the eighth right shifter (49) and the tenth right shifter (52); ), The tenth adder (54) for adding again the signal output from the ninth right shifter (5).
1) and the signal output from the tenth adder (54) are added again and the interpolated peripheral blue hue signal B122 is added.
, And an eleventh adder (56) that outputs

As described above, R, R
G, B value is determined, to enable the shift and addition operations only by a simple interpolation process.

[0033] As described above, the present invention is not limited to the embodiments and drawings of the embodiments described above, the can be variously modified without departing from the technical idea of the present invention is naturally der
You.

[0034]

The present invention according to the present invention constitutes a color filter array that does not require a vertical interpolation structure <br/> formed using only shifts and adders each color signal by pixel are possible horizontal interpolation processing It provides the processing speed is fast and <br/> enable high-speed processing, and effect that can be reduced consumable design area and power in a simple circuit configuration by the.

[Brief description of the drawings]

FIG. 1 is a conventional red, green, is a diagram illustrating the structure of a color filter array for signal processing blue.

Are views illustrating the structure of a color filter array according to the present invention; FIG.

FIG. 3 is a block diagram for horizontal interpolation processing in the configuration of the color filter array according to the present invention .

[Description of Signs] 30, 31, 35, 36, 46, 47, signal registers,
Hue signal storage means 32, 33, 37, 38, 40, 41, 48, 49, 5
1,52 Right shifter, shifting means 34,39,42,43,44,45,50,53,5
4, 55, 56 adder, adding means 300 green (G) hue signal section 400 red (R) hue signal section 500 blue (B) hue signal section G ₁ first green hue filter signal G ₂ second green hue filter signal R ₁ first red hue filter signal R ₂ second red hue filter signal B ₁ first blue hue filter signal B ₂ second blue hue filter signal

Claims (13)

(57) [Claims] 1. A green hue filter and a red hue filter.
Filter and blue hue filters are arranged in a matrix
That color image sensor odor <br/> including a filter array Te, the color filter array, and a filter of a green hue to be twice than the number of red and blue color, horizontal direction for horizontal interpolation
Red and blue color filters in direction is located in every four pixels, the green color filter is to position every two pixels, three horizontal la arranged vertically continuously
One of them is to repeat the RGBG pattern
The other one is to reverse the G-R-G-B pattern.
And the other one is a B-G-R-G pattern
Is repeated , but the pattern repeats every three horizontal lines in the vertical direction.
Color filter array characterized in that
An image sensor including: 2. A green hue signal for each pixel located horizontally adjacent to the green hue filter of the color filter array is obtained from two green hue filters located on both sides of the pixel in the horizontal direction. The signals are respectively assigned to the first green hue signals.
Filter signal and second green hue filter signal
2. The method according to claim 1 , wherein the first green hue filter signal and the second green hue filter signal are obtained by an operation of halving each of the first and second green hue filter signals and then adding them.
An image sensor including the color filter array according to 1. 3. The color filter array according to claim 1 ,
The signals obtained from the two red hue filters existing close to each other on the horizontal line are each converted into a first red hue filter signal.
And the second red hue filter signal,
Red color filter and red color signals are respectively the first red color filter signal and the second red color filter signal 1/2 for the blue hue filter is covered pixels between the two pixels red color filter is covered The color filter array according to claim 1, wherein the color filter array is obtained by an operation of adding the color filters and adding them.
Image sensor . 4. The color filter array according to claim 1 ,
Two red hue filters that are close to each other on the horizontal line
Filters from the first red hue filter signal.
And the second red hue filter signal , the green hue filter between the pixels covered by the first red hue filter and the second red hue filter is located closer to the first red hue filter. The red hue signal for the pixel is obtained by adding a value obtained by halving the first red hue filter signal and a value obtained by １ ／ times the first red hue filter signal, and then halving the second red hue filter signal. The image sensor including the color filter array according to claim 1, wherein the image sensor is obtained by an operation of adding values again. 5. The color filter array according to claim 1 ,
Two red hue filters that are close to each other on the horizontal line
Filters from the first red hue filter signal.
And the second red hue filter signal,
The red hue signal for the pixel covered by the green hue filter located closer to the second red hue filter between the pixels covered by the red hue filter and the second red hue filter is the second red hue filter signal. 2. A value obtained by adding a value obtained by multiplying the first red hue filter signal by １ ／ and a value obtained by adding a value obtained by multiplying the first red hue filter signal by 再 び. An image sensor including the color filter array according to 1 . 6. The color filter array according to claim 1 ,
Two blue hue filters that are close to each other on the horizontal line
Filters from the first blue hue filter and
And a second blue hue filter signal, a blue hue signal for a pixel covered by the red hue filter between the pixels covered by the first blue hue filter and the second blue hue filter is a first blue hue filter. The image sensor including a color filter array according to claim 1, wherein the signal and the second blue hue filter signal are obtained by an operation of multiplying each of them by １ ／ and then adding them. 7. The color filter array according to claim 1 ,
Two blue hue filters that are close to each other on the horizontal line
Each of the signals obtained from the
And the second blue hue filter signal, the green hue filter located closer to the first blue hue filter between pixels covered by the first blue hue filter and the second blue hue filter is covered The blue hue signal for the pixel is a value obtained by multiplying the first blue hue filter signal by １ ／, and 1
2. An image sensor including a color filter array according to claim 1, wherein the value is obtained by adding a value which is / 4 times and then adding again a value which is １ ／ times the second blue hue filter signal. . 8. The color filter array according to claim 1 ,
Two blue hue filters that are close to each other on the horizontal line
Each of the signals obtained from the first
And the second blue hue filter signal , the first
Between the pixel covered by the green hue filter and the pixel covered by the green hue filter located closer to the second blue hue filter between the pixels covered by the blue hue filter and the second blue hue filter
The blue hue signal is a value obtained by multiplying the second blue hue filter signal by １ ／ and 1
The image including the color filter array according to claim 1, wherein the image is obtained by adding a value which is / 4 times and then adding again a value which is 1/4 times the first blue hue filter signal. Sensor . 9. The method according to claim 2, wherein the value obtained by multiplying each hue filter signal by １ ／ is obtained by shifting each hue filter signal by one bit in a lower bit direction. An image sensor comprising the color filter array according to claim 1. 10. Configure green hue filter to be twice than the number of red and blue color filters, water
Red and blue color filters for flat interpolation calculation
The green color filter is located every four pixels in the horizontal direction, and is arranged continuously in the vertical direction every two pixels.
One of the three horizontal lines is RGB-
The G pattern is repeated and the other is GR
-GB pattern is repeated and the other one is B
-G-R-G pattern is repeated but vertical
A device for interpolating a hue signal for each pixel of a color filter array in which a pattern is formed for every three horizontal lines in each direction, and two pixels existing close to any one of the horizontal lines Gris
The signals obtained from the color hue filters are respectively the first green
A hue filter signal and a second green hue filter signal
In this case, the first and second green hue filter signals are interpolated to exist between the two green hue filters.
A green hue signal section for outputting a green hue filter signal of a pixel, and two red hue signals existing close to one of the horizontal lines.
The signals obtained from the hue filters are respectively the first red hue.
A filter signal and a second red hue filter signal.
At this time, the first and second red hue signals are interpolated to obtain the second
A red hue signal section for outputting a red hue signal of a pixel existing between the two red hue filters, and two blue hues existing in close proximity to one of the horizontal lines.
-The signals obtained from the hue filters are each converted to the first blue hue.
A filter signal and a second blue hue filter signal
When interpolates the first and second blue color filter signal
Blue hue signal portion and the color complementary between devices you characterized by being provided with that outputs blanking <br/> Lou hue signals of pixels existing between the two blue hue filter Te. 11. The green hue signal section comprises:
A first and a second green hue filter signal received and accumulated from the first and second green hue filters
First and second green hue signal accumulating means, first and second shifting means for shifting the signals output from the first and second green hue signal accumulating means by one bit in the lower bit direction, respectively, and the first shifting means 11. The image forming apparatus according to claim 10, further comprising: a first adding unit that adds a signal output from the second shifting unit and outputs a green hue signal of a peripheral pixel interpolated by adding the signals output from the second shifting unit. color complementary between devices according. 12. The first and second red hue filters receive the first and second red hue filters.
First and second red hue signal accumulating means for receiving and accumulating the red hue filter signal; and third and fourth means for shifting the signals output from the first and second red hue signal accumulating means one bit at a time in the lower bit direction. Fourth shifting means, and a pixel between the first red hue filter and the pixel covered with the red hue filter interpolated by adding the signals output from the third shifting means and the fourth shifting means. A second adding means for outputting a red hue signal for the pixel covered with the blue filter, and a fifth means for re-shifting the signal output from the third or fourth shifting means one bit at a time in the lower bit direction.
Or sixth shifting means; third adding means for adding again the signals output from the third shifting means and the fifth shifting means; output from the sixth shifting means and the third adding means. The green hue filter between the pixels covered by the first red hue filter and the second red hue filter interpolated by adding the signals to be added again is positioned closer to the first red hue filter. A fourth adding means for outputting a red hue signal for the pixel, a fifth adding means for adding again the signals output from the fourth shifting means and the sixth adding means, a fifth shifting means, The signal output from the fifth adding means is added again and the first red hue filter and the second red hue filter between the pixels covered by the second red hue filter interpolated. Hue of claim 10, characterized in that it is made in and a sixth adding means for outputting a red color signal for the green hue filter covered pixels located closer to 2/5 red color filter Interpolator. 13. The first and second blue hue filters include first and second blue hue filters.
First and second blue hue signal accumulating means for receiving and accumulating the blue hue filter signal; and seventh and fourth means for shifting the signals output from the first and second blue hue signal accumulating means one bit at a time in the lower bit direction. Eighth shifting means, and pixels covered by the first blue hue filter and the second blue hue filter interpolated by adding signals output from the seventh shifting means and the eighth shifting means. A seventh adder for outputting a blue hue signal to a pixel covered with the red hue filter, and a signal output from the seventh or eighth shifting means, each of which is shifted one bit at a time in the lower bit direction. Ninth
Or a tenth shift pos- sesses means, and eighth addition means for adding the signal output from the seventh shifting means and the ninth shifting means again from the tenth shifting means and the eighth addition means The green hue filter located closer to the first blue hue filter between the pixels covered with the first blue hue filter and the second blue hue filter interpolated by adding the output signals again and interpolated. Ninth adding means for outputting a blue hue signal for the shifted pixel, tenth adding means for adding again the signals output from the eighth shifting and the tenth shifting, the ninth shifting means and the above Between the pixels covered with the first blue hue filter and the second blue hue filter interpolated by adding again the signals output from the tenth addition means 11. An eleventh adding means for outputting a blue hue signal for a pixel covered by the green hue filter which is located closer to the second blue hue filter. color complementary between devices.